Scale.



No. 853,903. PATENTED MAY 14, 1907. F. SHAW.

SCALE. APPLICATION FILED HAB- 8,-1906.

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H. F. SHAW.

SCALE.

APPLIOATIOH FILED HA3. 3. '1906.

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UNITED STATES PATENT OFFICE.

HENRY F. SHAW, OF WEST ROXBURY, MASSACHUSETTS, ASSIGNOR OF ONE- THIRD TO GEORGE F. SHAW, OF DEDHAM, MASSACHUSETTS, AND ONE- THIRD TO GEORGE E. WHIPPLE, OF WEST ROXBURY, MASSACHUSETTS.

SCALE.

Specification of Letters Patent.

Patented May 14, 1907.

Application filed March 8, 1906. Serial No. 304,889-

To all ill/7,0771, it may concern:

Be it known that I, HENRY F. SHAW, a citizen of the United States, residing at West Roxbury, in the county of Suffolk and State of Massachusetts, have invented new and useful Improvements in Scales, of which the following is a specification.

The object of this invention is to provide a scale for indicating the weights of different articles in which an indicator is operated by a weighted scale beam, the device being constructed entirely without springs of any kind and the indicator preferably consisting of a rotary index finger in combination with a disk-shaped dial.

The invention consists in the combination and arrangement of parts set forth in the following specification and particularly pointed out in the claims thereof.

Referring to the drawings: Figure 1 is a side elevation of my improved gravity scale, a portion of the U-shaped part of the frame thereof being broken away to more clearly illustrate the device. Fig. 2 is an enlarged section, partly in elevation, taken on line 22 of Fig. 1. Fig. 3 is an enlarged rear elevation of the indicator and actuating segment gear, the parts being broken away to save space. Fig. 4 is a section, partly in elevation, taken on line 44 of Fig. 3. Fig. 5 is an enlarged section, partly in elevation, taken on line 55 of Fig. 1. Figs. 4 and 5 are broken away'to save space in the draw- Tiike numerals refer to like parts throughout the several views of the drawings.

In the drawings, 8 is a frame adapted to be fastened to the wall. Said frame has pivot ally supported thereon a scale beam 9 consisting of two arms 10 and 11 located upon opposite sides of a pivotal pin 12. The pin 12 is supported at its opposite ends in the U- shaped portion 13 of the frame 8. Said scale beam is mounted upon ball bearings 14, 14 (Fig. 5). The arm 10 is connected by a link 15 to a controlling arm 16 rotatably supported upon a pivotal pin 17, said arm 16 being provided. with roller bearings 18, and the pin 17 being rigidly fastened to the U-shaped portion of the frame 8. Said link 15 is bifurcated at its opposite ends to straddle the arms 10 and 16 and is connected to said. arms by pointed screws 29, 29, the pointed ends of said screws located in V-shaped recesses formed in hardened. centers 30 inserted in the arms 10 and 16.

l/Veights 19 and 20 are adjustably fastened to the arms 10 and 16, respectively. It will be noted that the weight 19 is farther removed from the center of the pivotal pin 12 than the weight 20 is from its pivotal pin 17. Therefore, the two arms 10 and 16, which form in operation a species of pendulum, would, if oscillated separately upon their pivots, move in different time, and when these two arms or pendulums are connected one to the other, the tendency of one of said pendulums or arms to oscillate in a different time from the other, to which it is connected, counteracts said oscillating tendency of one of said arms with relation to the other and counteracts, to a great extent, the oscillation of a segment gear 21 and. the vibration of the index finger 26 geared. thereto, which is very annoying to any one using a scale with an indicator of the character described, that is, a rotary index finger indicator.

The segment gear 21 is fastened to the scale beam 9 and meshes into a pinion 22 fast to a shaft 23 rotatably supported upon the two arms 24, 24 of a bracket 25 which is rigidly fastened to the U-shaped portion of the frame 8. The index finger 26 is fastened to the front end of the shaft 23 and is rotated thereby over the front face of the dial plate 27, said dial plate being inclosed within an indicator casing 28 rigidly fastened to one of the arms 24.

The arm 11 of the scale beam 9 has a convexly curved surface 31 formed thereon and along this surface a flexible supporting member 32 extends, said flexible supporting member being fastened at one end to said scale beam by a screw 33 and clamp plate 34. The other end of said flexible member 32 has an eye 35 fast thereto which supports a hook 36 and pan 37, said pan forming a receptacle for articles to be weighed. The surface 31 upon the arm 11 is formed upon a curve which gradually increases in distance from the axis of rotation of the scale beam, so that said curve is eccentric to the axis of rotation of said beam, or, in other words, the median axial line of the pivot 12 as it recedes from the portion of said flexible member which is fastened to said beam, so that for each pound which is placed upon the receptacle 37 the index finger 26 will be turned to an equal angle, or to the different points indicated, 1, 2, 3 et cetera, upon the face of the dial plate 27.

The scale beam 9, consisting of the arms 10 and 1 1, constitutes in its operation a bent lever and the curved surface 31 is laid out in accordance with the laws governing equilibrium of bent levers, so that as the arms 10 and 16 are moved upwardly by the application of weights to the receptacle 37, the leverage of the arm 11 shall be the correct amount, as compared with the arms 10 and 16, to move the segment lever 21 through the same angle for each additional pound placed upon the receptacle or pan 37, thus moving the index finger 26 through an equal angle for each additional pound placed upon said receptacle or pan.

The operation of the device hereinbefore specifically described is as follows: The article to be weighed is placed upon the receptacle or pan 37 and according to the weight of said article the flexible member 32 pulls downwardly upon the arm 11 of the scale beam 9, causing the weighted arms 10 and 16 to move upwardly from the position illustrated in Fig. 1 until the segment lever 21 has been rocked sufficiently to cause the pinion gear 22 and index finger 26 to rotate toward the right (Fig. 1) to a point corresponding upon the dial to the weight which has been placed upon the pan 37.

The advantage secured by my improved scale is that no springs are used, an indicator is obtained in which a rotary index finger is used to indicate the number of pounds placed upon the pan, and the vibration of the index finger, so common to scales using a rotary index finger, is substantially eliminated.

Having thus described my invention, what I claim and desire by Letters Patent to secure is:

1. A scale comprising in its construction a pivotally supported beam, a pivotally supported controlling arm, a link connecting said. controlling arm to one arm of said scale beam, and a weight fast to each of said arms, respectively, at different distances from their respective axes of rotation, said axes being located in a plane at an angle to a vertical plane, and the axis of rotation of said controlling arm being located above the axis of rotation of said beam.

2. A scale comprising in its construction a pivotally supported beam, one arm of said beam having a curved surface thereon, aflexible supporting member fast to said beam extending along said curved surface, a pivotally supported controlling arm, and a link connecting said controlling arm to one arm of said scale beam, said controlling arm and beam arm adapted to oscillate in substantially different time, the axes of rotation of said beam and said controlling arm being located in a plane at an angle to a horizontal plane and the axis of said controlling arm being located above the axis of said beam.

3. A scale comprising in its construction a pivotally supported beam, one arm of said beam having a curved surface thereon, ailexible supporting member fast to said. beam extending along said curved surface, a pivotally supported controlling arm, a link connecting said controlling arm to one arm of said scale beam, said controlling arm and beam arm adapted to oscillate in substantially different time, and an indicator opera tively connected to said scale beam, the axes of said beam and said controlling arm being located in a plane at an angle to a horizontal plane and the axis of said controlling arm being located above the axis of said. beam.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

HENRY F. SHAV. Vitnesses Crmnrns S. GOODING, ANNIE J. DAILEY. 

